<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
</html>
<script>
     var aa = prompt('输入摄氏度')
     var bb = 9 / 5
     var cc = bb * aa 
     var dd = cc + 32
     alert('所对应的华氏度为'+ dd )
</script>